[ableal]

The 3quarks.com page is exhaustive in detail about the station clock, with a customizable working clock well worth a look.

At the end the author, Rüdiger Appel, points to his free iOS clock app: http://itunes.apple.com/en/app/clockmaker/id493255256?mt=8

[wickedchicken]

I meant a physical wall clock, not an app. I suppose I could mount and iPad on my wall and run the app, but I don't want to spend several hundred dollars on a clock that will sue me.